package com.wad.redis;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.io.Serializable;
import java.nio.charset.Charset;

/**
 *
 * Redis使用FastJson进行序列化
 * @author wad
 * @date 2022/11/11 15:39
 * @project JWT_DEMO2
 **/
public class FastJsonRedisSerializer<T> implements RedisSerializer {

    public static final Charset DEFAULT_CHARSET=Charset.forName("UTF-8");//指定默认序列化编码

    private Class<T> clazz;

    static {
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
    }

    public FastJsonRedisSerializer(Class<T> clazz){
        super();
        this.clazz=clazz;
    }
    @Override
    public boolean canSerialize(Class type) {
        return RedisSerializer.super.canSerialize(type);
    }

    @Override
    public Class<?> getTargetType() {
        return RedisSerializer.super.getTargetType();
    }

    @Override
    public byte[] serialize(Object o) throws SerializationException {
        if (o==null){
            return new byte[0];
        }
        return JSON.toJSONString(o, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public Object deserialize(byte[] bytes) throws SerializationException {
        if (bytes==null || bytes.length<=0){
            return null;
        }
        String str=new String(bytes,DEFAULT_CHARSET);
        return JSON.parseObject(str,clazz);
    }


    protected JavaType getJavaType(Class<T> clazz){
        return TypeFactory.defaultInstance().constructType(clazz);
    }
}
